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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in Volkswagen Golf 4?

Problem appears while driving. Air conditioning does not turn on. Problem after collision or accident

Q: How to fix Air conditioning stopped cooling / no response to AC button in Volkswagen Golf 4?

Replacing the melted fuse box on the battery and making new cable ends. Open the hood, look at the black box on the battery. If the plastic next to the metal plates (fuses) is melted, you have the reason for the lack of air conditioning. A classic in PQ34.

in Volkswagen Golf 4 (1997-2005)

Symptoms

Problem appears while driving
Air conditioning does not turn on
Problem after collision or accident

DTC error codes

High pressure cutoff

Verifying license...

Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

VIII

Refrigerant: R1234yf Amount (g): 430-480g Oil: PAG YF ISO 46 Oil (ml): 120 - 140ml

VII kompresor Denso 6SES14C + 6SAS14

Refrigerant: R1234yf Amount (g): 460g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 110ml

VII kompresor MAHLE/Delphi 6CVC140 + Visteon

Refrigerant: R1234yf Amount (g): 460g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 120ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Golf 4

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